First of all, a big thanks to russ553. This tool seems to be a good one.
It can only run from a live CD. I downloaded and burned the iso.
When you run it from CD, there is a wheel on the left side of the screen. Click Administration and then "Install to USB Drive" if you want to make a bootable USB,
otherwise select Backup or Restore options on the desktop.
I have backed up two partitions, one ext3 and one ext4.
To backup the ext3 partition (10.3 GB , 37% used), I used the CD. It took less than 4 minuttes and the image was 1.6 GB big. (The same image made by Norton Ghost took over 20 minuttes and was 1.7 GB big.)
To backup the ext4 partition (12.1 GB , 40% used), I used the USB. It took less than 10 minuttes and the image was 2.7 GB big. (The same image made by Clonezilla took about the same time and was about the same size.)
I used it to restore my ext4 partition. It took less than 4 minuttes.
I haven't used it to restore my ext3 partition yet.
Pros:
Very nice GUI, easy to do tasks, lots of additional useful tools, backup to network drive, works for both Linux and Windows
Cons:
It boots extremely slow (up to 3 minuttes)
Conclusion: If you are tired of Clonezilla's command lines, and want something that looks pretty and works for both ext3 and ext4 partitions, you will love this tool.